AbstractThe joint French-German programme of direct broadcasting is comprised of two distinct phases, i.e. 1. the development of the preoperational spacecraft (D3, F3), with 3 active channels out of 5 installed;2. the production of operational satellites (D5, F5) with 5 channels active, each of them redundant.Aerospatiale is in charge among others of the Thermal Control of the Spacecraft. This paper deals with: thermal concept, analyses and tests programme.The developed platforms should also permit an easy adaptation to various payloads characterized by higher electrical power levels.The high power levels involved imply advanced thermal control for both Main Body and Antenna Module. The thermal control concept must have the following capabilities: • to transfer the concentrated, high power dissipations involved toward outer space,• to maintain in shadow phase (no emission) the correct temperatures with low or zero heating power,• to ensure, in transfer orbit phase (maximum duration about 300 h), satisfactory temperatures with reduced electrical power (satellite 3-axis stabilized, solar generator partially deployed),• to allow extremely non-symmetrical functionings.To solve these various problems, so far never simultaneously encountered on existing satellites, the following devices are used: • various heat pipe networks (D3/F3; 88 heat pipes, total length approx. 118 m),• large quantity of Optical Solar Reflectors (silica mirror, area approx. 6.3 m2),• lightweight superinsulations,• various types of heaters,• Thermal Control Electronic (TCE) to switch ON/OFF heaters and monitor thermistors.
Advanced thermal control for french-german direct broadcasting satellites TDF1/TVSAT
Acta Astronautica ; 11 , 9 ; 553-563
1983-10-19
11 pages
Article (Journal)
Electronic Resource
English
French-German Broadcasting Satellites Advanced Thermal Control
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